?2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN9611 " Rev. 1.1.7
32
Evaluation Board
FEB388: 400-W Evaluation Board Using FAN9611
FEB388 is one of the evaluation boards for an interleaved
dual boundary-conduction-mode PFC converter. It is
rated at 400 W (400 V/1 A) power. With phase
management, efficiency is maintained above 96% even
down at 10% of the rated output power. The efficiencies
for full-load condition exceed 96% as shown below.
Figure 62 and Figure 63 show the phase management
with the default minimum threshold values of the IC.
They can be adjusted upwards to achieve a different
efficiency profile (Figure 64 and Figure 65) where phase
management thresholds are adjusted to 30% / 44% of
the full load. For full specification, design schematic, bill
of materials and test results; see FEB388 FAN9611/12
400-W Evaluation Board User Guide (AN-9717).
Input Voltage
Rated Output Power
Output Voltage (Rated Current)
V
IN
Nominal: 85 V~264 V
AC
V
DD
Supply: 13 V~18 V
DC
400 W
400 V (1 A)
Figure 62. Measured Efficiency at 115V
AC
(Default Thresholds)
Figure 63. Measured Efficiency at 230V
AC
(Default Thresholds)
Figure 64. Measured Efficiency at 115V
AC
(Adjusted Thresholds)
Figure 65. Measured Efficiency at 230V
AC
(Adjusted Thresholds)
80
85
90
95
100
10
20
30
40
50
60
70
80
90
100
Output Power (%)
FAN9611 Efficiency vs. Load
(115 V
AC
Input, 400 V
DC
Output, 400 W)
With Phase Management
Without Phase Management
80
85
90
95
100
10
20
30
40
50
60
70
80
90
100
Output Power (%)
FAN9611 Efficiency vs. Load
(230 V
AC
Input, 400 V
DC
Output, 400 W)
With Phase Management
Without Phase Management
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